def encryptHex(p_x, KEY):
KEY_b = hexToBin(KEY)
assert (len(KEY_b) == 64), 'KEY is not the correct size: encryptString'
assert (len(p_x) == 16), 'hex plaintext not long enough'
p_b = hexToBin(p_x)
c_b = encryptBlock(p_b, KEY_b)
c_x = binToHex(c_b)
return c_x
def encryptFile(filename, KEY):
KEY_b = hexToBin(KEY)
assert (len(KEY_b) == 64), 'Incorrect key'
l = []
with open(filename, 'rb') as f:
while True:
b = f.read(8)
if b == b'': # end of file
break
p_b = bytesToBinString(b)
c_b = encryptBlock(p_b, KEY_b)
c_x = binToHex(c_b)
l.append(c_x)
# yield (c_x)
return ''.join(l)
def sanityCheck1():
x0 = [0x94, 0x74, 0xb8, 0xe8, 0xc7, 0x3b, 0xca, 0x7d]
x16 = [0x1b, 0x1a, 0x2d, 0xdb, 0x4c, 0x64, 0x24, 0x38]
x = x0
for i in range(16):
setKey(x)
if i % 2 == 0:
x = encryptBlock(x) # x[i+1] = E(x[i], x[i)
else:
x = decryptBlock(x) # x[i+1] = D(x[i], x[i)
try:
assert x == x16
except AssertionError:
return False
return True
def sanityCheck1():
"""Tests single-block DES encryption & decryption
using algorithm proposed by Ronald Rivest
(http://people.csail.mit.edu/rivest/Destest.txt)"""
x0 = [0x94, 0x74, 0xb8, 0xe8, 0xc7, 0x3b, 0xca, 0x7d]
x16 = [0x1b, 0x1a, 0x2d, 0xdb, 0x4c, 0x64, 0x24, 0x38]
x = x0
for i in range(16):
setKey(x)
if i % 2 == 0:
x = encryptBlock(x) # if i is even, x[i+1] = E(x[i], x[i)
print(x)
else:
x = decryptBlock(x) # if i is odd, x[i+1] = D(x[i], x[i)
try:
assert x == x16
except AssertionError:
return False
return True
# E(X,K) denotes the DES encryption of X using key K, and D(X,K) denotes
# the DES decryption of X using key K. If you obtain
# X16 = 1B1A2DDB4C642438
# your implementation does not have any of the 36,568 possible single-fault
# errors.
"""
http://people.csail.mit.edu/rivest/Destest.txt
"""
from util import binToHex, hexToBin
from des import encryptBlock, decryptBlock
X0 = '9474B8E8C73BCA7D'
X16 = '1B1A2DDB4C642438'
b = hexToBin(X0)
print(binToHex(b))
for i in range(16):
if i % 2 == 0:
b = encryptBlock(b, b)
else:
b = decryptBlock(b, b)
print(binToHex(b))
if b == hexToBin(X16):
print('\nDES is working.')
else:
print('\nDES is not working.')
print('\nAs given in http://people.csail.mit.edu/rivest/Destest.txt')